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//
// RBLPopover.h
// Rebel
//
// Created by Danny Greg on 13/09/2012.
// Copyright (c) 2012 GitHub. All rights reserved.
//
#import <Cocoa/Cocoa.h>
@class RBLPopover;
@class RBLPopoverBackgroundView;
// Defines the different types of behavior of a RBLPopover.
//
// RBLPopoverBehaviorApplicationDefined - The application decides when the
// popover should open and close, by
// doing so manually.
// RBLPopoverBehaviorTransient - If there is a mouse down anywhere
// other than in the popover the popover
// is closed. It is also closed if the
// app or parent window lose focus or
// `esc` is pressed.
// RBLPopoverBehaviorSemiTransient - Closes the popover only if there is a
// mouse up within the popover's parent
// window or `esc` is pressed.
typedef enum : NSUInteger {
RBLPopoverBehaviorApplicationDefined = 0,
RBLPopoverBehaviorTransient = 1,
RBLPopoverBehaviorSemiTransient = 2
} RBLPopoverBehavior;
typedef void (^RBLPopoverDelegateBlock)(RBLPopover *popover);
// A popover.
// This aims to replicate the API of `NSPopover`, within reason, whilst offering
// more flexibility when it comes to customising of its appearance.
//
// One notable difference in behaviour when compared to `NSPopover` is memory
// management. `RBLPopover` does not retain itself and when it deallocates it
// will be removed from screen. Therefore a reference must be kept to the popover
// (or it should be otherwise retained) for as long as it should appear on
// screen.
//
// A note on layers: by default the clipping method which the popover uses to
// clip its subviews to its outline does _not_ support any layer backed or
// hosting views. This can be worked around by adding mask layers to any layers
// you add to the popover or its subviews.
@interface RBLPopover : NSResponder
// The view controller providing the view displayed within the popover.
@property (nonatomic, strong) NSViewController *contentViewController;
// The popover's background view. You may set your own view, which is useful for
// customizing the appearance of the popover.
@property (nonatomic, strong, readonly) RBLPopoverBackgroundView *backgroundView;
// The size that, when displayed, the popover's content should be.
// Passing `CGSizeZero` uses the size of the `contentViewController`'s view.
@property (nonatomic) CGSize contentSize;
/// The anchor point of the popover in unit coordinate space.
///
/// This specifies the alignment of the popover to the origin view along the
/// secondary axis. If the popover is on the Y edge, this will determine the X
/// position of the popover; it it's on the X edge, it will determine the Y
/// position.
///
/// A 0 will align the left or bottom edges of the popover and the origin view.
/// A 1 will align the right or top edges.
///
/// The default value is (0.5, 0.5), indicating the center of the popover.
@property (nonatomic, assign) CGPoint anchorPoint;
// Whether the next open/close of the popover should be animated.
// Note that this property is checked just before the animation is performed.
// Therefore it is possible to animate the showing of the popover but hide the
// closing and vice versa.
@property (nonatomic) BOOL animates;
// How the popover should respond to user events, in regard to automatically
// closing the popover.
// See the definition of `RBLPopoverBehavior` for more
// information.
@property (nonatomic) RBLPopoverBehavior behavior;
// Whether the popover is currently visible.
@property (nonatomic, readonly, getter = isShown) BOOL shown;
// Called before the popover is closed.
@property (nonatomic, copy) RBLPopoverDelegateBlock willCloseBlock;
// Called after the close has completed.
// Note that if the close is animated this block will be called _after_ the
// animation has successfully completed.
@property (nonatomic, copy) RBLPopoverDelegateBlock didCloseBlock;
// Called before the popover is opened.
@property (nonatomic, copy) RBLPopoverDelegateBlock willShowBlock;
// Called after the block has opened.
// Note that if the open is animated this block will be called _after_ the
// animation has successfully completed.
@property (nonatomic, copy) RBLPopoverDelegateBlock didShowBlock;
// Use for animation when showing and closing the popover.
@property (nonatomic, assign) NSTimeInterval fadeDuration;
// Whether the popover can become the key window.
//
// Defaults to `NO`.
@property (nonatomic, assign) BOOL canBecomeKey;
// Returns a newly initialised `RBLPopover` with a `RBLPopoverBackgroundView`.
- (instancetype)initWithContentViewController:(NSViewController *)viewController;
// Designated initialiser.
//
// Returns a newly initialised `RBLPopover`.
- (instancetype)initWithContentViewController:(NSViewController *)viewController backgroundView:(RBLPopoverBackgroundView *)backgroundView;
// Displays the popover
//
// If the popover is already visible, this will move the popover to be
// re-positioned with the given `positioningRect` and `prederredEdge`.
//
// positioningRect - The area which the popover should "cling" to. Given in
// positioningView's coordinate space.
// positioningView - The view which the positioningRect is relative to.
// preferredEdge - The edge of positioningRect which the popover should
// "cling" to. If the entire popover will not fit on the
// screen when clinging to the
// preferredEdge another edge will be used to ensure the
// content is visible. In the event that no edge allows the
// popover to fit on the screen, preferredEdge is used.
- (void)showRelativeToRect:(CGRect)positioningRect ofView:(NSView *)positioningView preferredEdge:(CGRectEdge)preferredEdge;
// Closes the popover with the `fadeDuration` (if the popover animates).
- (void)close;
// Convenience method exposed for nib files.
- (IBAction)performClose:(id)sender;
@end
@interface RBLPopoverBackgroundView : NSView
// Given a size of the content this should be overridden by subclasses to
// describe how big the overall popover should be.
//
// contentSize - The size of the content contained within the popover.
// popoverEdge - The edge that is adjacent to the `positioningRect`.
//
// Returns the overall size of the backgroundView as a `CGSize`.
- (CGSize)sizeForBackgroundViewWithContentSize:(CGSize)contentSize popoverEdge:(CGRectEdge)popoverEdge;
// Given a frame for the background this should be overridden by subclasses to
// describe where the content should fit within the popover.
// By default this sits the content in the frame of the background view whilst
// nudging the content to make room for the arrow and a 1px border.
//
// frame - The frame of the `backgroundView`.
// popoverEdge - The edge that is adjacent to the `positioningRect`.
//
// Returns the frame of the content relative to the given background view frame
// as a `CGRect`.
- (CGRect)contentViewFrameForBackgroundFrame:(CGRect)frame popoverEdge:(CGRectEdge)popoverEdge;
// The outline shape of a popover.
// This can be overridden by subclasses if they wish to change the shape of the
// popover but still use the default drawing of a simple stroke and fill.
//
// popoverEdge - The edge that is adjacent to the `positioningRect`.
// frame - The frame of the background view.
//
// Returns a `CGPathRef` of the outline of the background view.
- (CGPathRef)newPopoverPathForEdge:(CGRectEdge)popoverEdge inFrame:(CGRect)frame;
// The edge of the target view which the popover is appearing next to. This will
// be set by the popover.
@property (nonatomic, assign, readonly) CGRectEdge popoverEdge;
// The rectangle, in screen coordinates, where the popover originated. This will
// be set by the popover.
@property (nonatomic, assign, readonly) NSRect popoverOrigin;
// The size of the arrow used to indicate the origin of the popover.
//
// Note that the height will always be the distance from the view to the tip of
// the arrow.
@property (nonatomic, assign) CGSize arrowSize;
// The color used to fill the shape of the background view.
@property (nonatomic, strong) NSColor *fillColor;
@end
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